package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;

@Component
public class RefreshTokenInterceptor implements HandlerInterceptor {


    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;

    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //TODO 获取请求头中的token
        String token = request.getHeader("authorization");
        //TODO 判断token是否存在
        if (StrUtil.isBlank(token)) {

            return true;

        }

        //TODo 此处改为从redis中获取用户信息
        String key = LOGIN_USER_KEY + token;
        //通过key来获取用户信息
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(key);

        if (userMap.isEmpty()) {

            return true;
        }

        //TODO 将查询到的hash数据封装为UserDTO对象，
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);

        //5.存在，把用户信息保存在ThreadLocal
        UserHolder.saveUser(userDTO);

        //TODO 刷新token有效期
        stringRedisTemplate.expire(key, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        //6.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
